<?php

/**
 * @package dompdf
 * @link    http://www.dompdf.com/
 * @author  Benj Carson <benjcarson@digitaljunkies.ca>
 * @license http://www.gnu.org/copyleft/lesser.html GNU Lesser General Public License
 * @version $Id: block_renderer.cls.php 448 2011-11-13 13:00:03Z fabien.menager $
 */

/**
 * Renders block frames
 *
 * @access private
 * @package dompdf
 */
class Block_Renderer extends Abstract_Renderer {

    //........................................................................

    function render(Frame $frame) {
        $style = $frame->get_style();
        list($x, $y, $w, $h) = $frame->get_border_box();

        $this->_set_opacity($frame->get_opacity($style->opacity));

        if ($frame->get_node()->nodeName === "body") {
            $h = $frame->get_containing_block("h") - $style->length_in_pt(array(
                        $style->margin_top,
                        $style->padding_top,
                        $style->border_top_width,
                        $style->border_bottom_width,
                        $style->padding_bottom,
                        $style->margin_bottom), $style->width);
        }

        // Draw our background, border and content
        if (($bg = $style->background_color) !== "transparent") {
            $this->_canvas->filled_rectangle($x, $y, $w, $h, $bg);
        }

        if (($url = $style->background_image) && $url !== "none")
            $this->_background_image($url, $x, $y, $w, $h, $style);

        $this->_render_border($frame);
        $this->_render_outline($frame);

        if (DEBUG_LAYOUT && DEBUG_LAYOUT_BLOCKS) {
            $this->_debug_layout($frame->get_border_box(), "red");
            if (DEBUG_LAYOUT_PADDINGBOX) {
                $this->_debug_layout($frame->get_padding_box(), "red", array(0.5, 0.5));
            }
        }

        if (DEBUG_LAYOUT && DEBUG_LAYOUT_LINES && $frame->get_decorator()) {
            foreach ($frame->get_decorator()->get_line_boxes() as $line) {
                $frame->_debug_layout(array($line->x, $line->y, $line->w, $line->h), "orange");
            }
        }
    }

    protected function _render_border(Frame_Decorator $frame, $corner_style = "bevel") {
        $style = $frame->get_style();
        $bbox = $frame->get_border_box();
        $bp = $style->get_border_properties();

        // If all the borders are "solid" with the same color and style, we'd better draw a rectangle
        if (
                in_array($bp["top"]["style"], array("solid", "dashed", "dotted")) &&
                $bp["top"] == $bp["right"] &&
                $bp["right"] == $bp["bottom"] &&
                $bp["bottom"] == $bp["left"]
        ) {
            $props = $bp["top"];
            if ($props["color"] === "transparent" || $props["width"] <= 0)
                return;

            list($x, $y, $w, $h) = $bbox;
            $width = $style->length_in_pt($props["width"]);
            $pattern = $this->_get_dash_pattern($props["style"], $width);
            $this->_canvas->rectangle($x + $width / 2, $y + $width / 2, $w - $width, $h - $width, $props["color"], $width, $pattern);
            return;
        }

        $widths = array($style->length_in_pt($bp["top"]["width"]),
            $style->length_in_pt($bp["right"]["width"]),
            $style->length_in_pt($bp["bottom"]["width"]),
            $style->length_in_pt($bp["left"]["width"]));

        foreach ($bp as $side => $props) {
            list($x, $y, $w, $h) = $bbox;

            if (!$props["style"] ||
                    $props["style"] === "none" ||
                    $props["width"] <= 0 ||
                    $props["color"] == "transparent")
                continue;

            switch ($side) {
                case "top":
                    $length = $w;
                    break;

                case "bottom":
                    $length = $w;
                    $y += $h;
                    break;

                case "left":
                    $length = $h;
                    break;

                case "right":
                    $length = $h;
                    $x += $w;
                    break;
                default:
                    break;
            }
            $method = "_border_" . $props["style"];

            $this->$method($x, $y, $length, $props["color"], $widths, $side, $corner_style);
        }
    }

    protected function _render_outline(Frame_Decorator $frame, $corner_style = "bevel") {
        $style = $frame->get_style();

        $props = array(
            "width" => $style->outline_width,
            "style" => $style->outline_style,
            "color" => $style->outline_color,
        );

        if (!$props["style"] || $props["style"] === "none" || $props["width"] <= 0)
            return;

        $bbox = $frame->get_border_box();
        $offset = $style->length_in_pt($props["width"]);
        $pattern = $this->_get_dash_pattern($props["style"], $offset);

        // If the outline style is "solid" we'd better draw a rectangle
        if (in_array($props["style"], array("solid", "dashed", "dotted"))) {
            $bbox[0] -= $offset / 2;
            $bbox[1] -= $offset / 2;
            $bbox[2] += $offset;
            $bbox[3] += $offset;

            list($x, $y, $w, $h) = $bbox;
            $this->_canvas->rectangle($x, $y, $w, $h, $props["color"], $offset, $pattern);
            return;
        }

        $bbox[0] -= $offset;
        $bbox[1] -= $offset;
        $bbox[2] += $offset * 2;
        $bbox[3] += $offset * 2;

        $method = "_border_" . $props["style"];
        $widths = array_fill(0, 4, $props["width"]);
        $sides = array("top", "right", "left", "bottom");

        foreach ($sides as $side) {
            list($x, $y, $w, $h) = $bbox;

            switch ($side) {
                case "top":
                    $length = $w;
                    break;

                case "bottom":
                    $length = $w;
                    $y += $h;
                    break;

                case "left":
                    $length = $h;
                    break;

                case "right":
                    $length = $h;
                    $x += $w;
                    break;
                default:
                    break;
            }

            $this->$method($x, $y, $length, $props["color"], $widths, $side, $corner_style);
        }
    }

}
